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S 3 Color Spot, Inc. June 28, 1991 (MB8168C) SITE ASSESSMENT AND MITIGATION cavation o£ the contaminated soil at Verbal approval to continue exas received from Ms. Diane the southwest corner o the boiler shed w further excavation and he collection of soil samples EHD. She agreed to with to confirm whether sufficient excavation had been conducted- about onducted. JTO enlarged the backhoeto on Figuret3in width, 6 to 8 feet in length, and excavation with he about 8 feet in depth, a The excavated soils were monitored with the PID which registered a Wherange of 30 to 100 pum of volatile hydrocarbon vapors.5mnl readings nearhe recently the PID had stabilized to background levels (2 Co PP f the stained soil had likely been stockpiled soils), it was observed that all o removed from the excavation. At the direction of Ms. Hinson, three additional soil samples were collected from this excavatisn7at81 and 19nwere from the middle,£rom westaside, and about 8 feet. Sample number , The is no sampe numbr 6.) east side of the excavationwere rethe backhoelbucketeand handledsinpthe same collected from the tooth-potion of manner as previously described. i LABORATORY ANALYSIS All soil samples were delivered within 24 hours of collection to f Coast to Coast Aned alyticaDe Department of Health Servicesrvices in Gole , �(DHS)laboratory ng those i24 by the State of Californiax P I i�aurs, he samples remained in the cooler with fresh ice. Chain-of-custody documentation ation is accompanied the samples and a copy of that samples received t included in Appendix A. As shown in Appendix A, the same r sealed, coaled, and intact by the laboratory. As required in the "Tri-Regional Board Staff Recommen dation gust lOr Preliminary Evaluation and Investigation of Underground Tank Sites, j. 1990, all the so samples were analyzed using aD chromato raethod rhft T masstspectrometal uer Hydrocarbon (modified) and EPA method 8260 (g g P / with cryogenic focusing. Diesel fuel number 2 was used s the reference standard. The analyses were for total petroleum boraCo y detect Pon limits for toluene, ethylbenzene, and total xylenes �BTEX). TP were 5.0 ppm and 4.005 PPm for BTEX.were also performed Analyses with det c ionl limits aof OE005 and ethylene dibromide (EDB)s (purge-and-trap). The samples were prepared by EPA method 5030 ppm. P ---- — --- As shown on Table 1, the only hydrocarbon-constituenr_de�ecte i)- T- of the soil samples collected below the tanks (sample numbers 1 thro m in these toluene. Toluene concentrations were 0.039, 0.085, 0.082. and 0,13 pp lied samples. Only sample number 4 (0.13 ppm) exceeded the DHS drinking water app action level of 0.1 ppm for toluene. Benzene, ethylbenz�ne, xylenes, EDC, EDB, and TPH were not detected by the laboratory in any of these four samples.